Sneathia is a genus of obligate anaerobic, Gram-negative bacteria in the phylum Fusobacteriota (formerly Fusobacteria). The primary species is S. sanguinegens (formerly Leptotrichia sanguinegens), with S. amnii also clinically significant. Sneathia is a member of the BV-associated bacterial consortium alongside gardnerella, atopobium, megasphaera, and prevotella, and is emerging as a significant organism in preterm birth, HPV persistence, and reproductive tract microbiome studies.
Vaginal Microbiome — BV Consortium
Sneathia is enriched in BV and Community State Type IV vaginal microbiomes, co-occurring with the Gardnerella-Atopobium biofilm community:
- Enriched in HPV-positive cervical microbiomes yang 2020 vaginal microbiome hpv16 shotgun metagenomics.
- Elevated in vaginal samples associated with preterm birth risk pruski 2021 desi ms vaginal microbiome preterm birth.
- Part of the statin-responsive BV microbiome — statins reduce Gardnerella vaginolysin and may affect the broader BV consortium abdelmaksoud 2017 statins vaginal microbiome gardnerella vaginolysin.
- Produces sialidase, contributing to mucosal barrier degradation alongside Atopobium roberts 2019 mucosal lactoferrin genital infections iron.
Endometriosis — Cervical Depletion
Like other BV-associated organisms, Sneathia is depleted in cervical samples from endometriosis patients, part of the distinctive ecological shift away from the BV consortium toward Enterobacteriaceae dominance ata 2019 endobiota study vaginal cervical gut microbiota endometriosis hicks 2025 oral vaginal stool microbial signatures endometriosis ser 2023 current updates microbiome endometriosis review shen 2022 vaginal microecological characteristics endometriosis.
Male Reproductive Tract
Emerging evidence of Sneathia in seminal fluid and male reproductive tract microbiome neto 2024 environmental factors seminal microbiome sperm quality magill 2023 male infertility human microbiome.
Cross-References
- gardnerella — primary BV biofilm initiator
- atopobium — BV consortium partner; co-depleted in endometriosis
- megasphaera — BV consortium partner
- prevotella — BV consortium partner
- endometriosis — cervical depletion pattern
- bacterial vaginosis — core BV-associated organism